SingleStore DB

CLEAR ORPHAN DATABASES

Removes orphaned partitions. Orphaned partitions are partition databases and tables on leaf nodes that are no longer considered part of the cluster.

Syntax
CLEAR ORPHAN DATABASES;
Remarks

Caution

This command cannot be undone.

  • The master aggregator avoids dropping orphan partition databases if there is no corresponding master partition.

  • To detect orphan partitions, run SHOW CLUSTER STATUS and check for partitions with the role of Orphan.

  • Before running CLEAR ORPHAN DATABASES, run: EXPLAIN CLEAR ORPHAN DATABASES; to see which partitions will be dropped.

  • Orphan tables are tables that don't exist in metadata but do exist on some partition databases. For example, if a table is dropped on the master in asynchronous replication and its node fails before it can succeed then the table could become an orphan table.

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